The provided is a spiral mesh chain conveyor, including a rotary drum and mesh chains, where the mesh chains enter a periphery of the rotary drum along a tangential direction and extend along a spiral line in a winding manner; a plurality of rotary drum upright posts and a plurality of driving vertical rods are uniformly arranged along a circumference of the rotary drum; an inner side of each link of the mesh chain close to the rotary drum is provided with a mesh chain guiding head; a guide member is sleeved on an outer wall of an inlet end of the rotary drum upright post; and a stroke increasing segment and a leading-in segment are sequentially provided on an outer wall of the guide member along a contact order of the mesh chain guiding head.